Company lists · Data refreshed September 2026

Top 25 Megafund private equity companies based in Houston, United States

RevenueBase identified 119 megafund private equity companies headquartered in Houston, United States as of September 2026 and tracks 1,527 professional contacts across them, including 820 with verified work emails. New York is the largest hub.

This list covers megafund private equity companies headquartered in Houston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
119Companies
1,527Contacts tracked
820Verified emails
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The 25 largest megafund private equity companies based in Houston, United States

Ranked by team size
Top 25 of 119 megafund private equity companies based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names megafund private equity companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
Quantum Capital GroupStrong evidence
Houston, TX, United StatesHQ checked Sep 5, 202651-200173

“Founded in 1998, Quantum Capital Group is a leading provider of private equity, credit, and venture capital to the global energy and energy transition industry, having managed…”

Source: company website · checked Sep 5, 2026
2
Lime Rock ResourcesIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 202651-200144

“Formed in 2005, Lime Rock Resources acquires, operates, and improves lower-risk oil and gas properties in the United States.”

Source: company website · checked Sep 5, 2026
3Houston, TX, United StatesHQ checked Sep 5, 202651-200131

“Main Street Capital (NYSE: MAIN) is a leading provider of long-term, flexible capital solutions to established lower middle market companies, supporting American businesses that…”

Source: company website · checked Sep 5, 2026
4
The Sterling GroupStrong evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-50120

“Founded in 1982, The Sterling Group, is a private equity investment firm that targets controlling interests in basic manufacturing, industrial services and distribution companies.”

Source: company website · checked Sep 5, 2026
5Houston, TX, United StatesHQ checked Sep 5, 202611-50109

“Stellus Capital Management is a leading private credit manager focused on the North American lower middle market.”

Source: company website · checked Sep 5, 2026
6
SCF PartnersPartial evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5054

“Founded in 1989, SCF Partners (“SCF”) provides equity capital and strategic growth assistance to build leading energy service and equipment companies that operate throughout the…”

Source: company website · checked Sep 5, 2026
7
Lime Rock PartnersIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5049

“Founded in 1998, Lime Rock Partners is a creative, value-adding, and long-term investor of growth capital in global energy companies in the exploration & production, energy…”

Source: company website · checked Sep 5, 2026
8
EIV Capital, LLCStrong evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5048

“Founded in 2009, EIV Capital is a Houston-based private equity firm specializing in providing growth equity to the North American energy industry.”

Source: company website · checked Sep 5, 2026
9
Trek ONE CapitalPartial evidence
Houston, TX, United StatesHQ checked Sep 5, 2026n/a40

“Trek One Capital is a family office backed private investment firm focused on lower and middle market acquisitions and strategic investments.”

Source: company website · checked Sep 5, 2026
10
Encap Investments L.PPartial evidence
Houston, TX, United StatesHQ checked Sep 5, 202651-20032

“EnCap Investments is a premier private markets investor with a multi-decade track record of value creation across the North American energy landscape.”

Source: company website · checked Sep 5, 2026
11
The Capstreet GroupIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5029

“Founded in 1990, Capstreet invests in lower middle market business services companies.”

Source: company website · checked Sep 5, 2026
12
Platform Partners LLCPartial evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5026

“Founded in 2006, Platform Partners LLC is a Houston-based private investment firm that partners with founders and executives of companies with enterprise values typically between…”

Source: company website · checked Sep 5, 2026
13Houston, TX, United StatesHQ checked Sep 5, 20261-1021

“Yellowstone Capital Partners, LLC is based in Houston and New York.”

Source: company website · checked Sep 5, 2026
14
JDH Capital CompanyPartial evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5020

“JDH Capital is a private investment firm based in Houston, TX.”

Source: company website · checked Sep 5, 2026
15Houston, TX, United StatesHQ checked Sep 5, 202611-5018

“BroadVail Capital Partners is a private equity firm that partners with best-in-class management teams to build institutional real estate investment platforms.”

Source: company website · checked Sep 5, 2026
16Houston, TX, United StatesHQ checked Sep 5, 202611-5017

“ApexOne Investment Partners is a privately held real estate investment firm and fund manager.”

Source: company website · checked Sep 5, 2026
17
Lilium Group LLCStrong evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5017

“Lilium Group LLC (“Lilium”) is a Houston-based private equity fund manager focused on middle market investments in the transportation and industrials sectors.”

Source: company website · checked Sep 5, 2026
18
Genesis ParkIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 20261-1016

“Founded in Genesis Park uses operational expertise, discipline and patience to build value for portfolio companies and investors, regardless of prevailing market conditions.”

Source: company website · checked Sep 5, 2026
19
Post OAK Energy CapitalStrong evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5016

“Post Oak Energy Capital is a Houston-based private equity firm primarily focused on making domestic investments in the upstream, midstream and oilfield services sectors of the…”

Source: company website · checked Sep 5, 2026
20
Amberjack Capital PartnersIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5015

“We empower companies to unearth their potential, build lasting value and break apart from the crowd.”

Source: company website · checked Sep 5, 2026
21
Dauntless Capital PartnersIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5014

“Dauntless Capital Partners invests in businesses across select industries where strategic capital and operational excellence can drive exceptional growth.”

Source: company website · checked Sep 5, 2026
22
TulcanIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 20261-1014

“Founded in 2005, Tulcan is a Houston-based family operating investment partnership.”

Source: company website · checked Sep 5, 2026
23
Jumana CapitalPartial evidence
Houston, TX, United StatesHQ checked Sep 5, 20261-1013

“Jumana is a private investment firm specializing in partnerships with entrepreneur lead companies that are looking to transform into enduring businesses.”

Source: company website · checked Sep 5, 2026
24Houston, TX, United StatesHQ checked Sep 5, 202611-5011

“Mountain Capital is an energy private equity firm established in 2015 by a team of experienced professionals led by Sam Oh.”

Source: company website · checked Sep 5, 2026
25
Thesis Capital PartnersIndirect evidence
Houston, TX, United StatesHQ checked Sep 5, 202611-5011

“Thesis Capital is an investment partnership that enables visionary entrepreneurs, operators, and family-owned businesses to become industry leaders.”

Source: company website · checked Sep 5, 2026

Showing 25 of 119 megafund private equity companies based in Houston, United States

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Megafund private equity companies based in Houston, United States at a glance

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 632 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
79
11-50
32
51-200
6
201-500
2

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 119 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among megafund private equity companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in Houston, United States whose own description of what they do matches “megafund private equity companies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among megafund private equity companies, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 820 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

How many megafund private equity companies are there based in Houston, United States?

RevenueBase identified 119 megafund private equity companies headquartered in Houston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Quantum Capital Group, headquartered in Houston, tops this list with the largest team on record.

Which city has the most megafund private equity companies?

New York leads with 632 headquartered companies, followed by Chicago (205) and Dallas (172).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 820 verified decision-maker contacts tracked across these 119 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.